Direct sums of Voronovskaja's type formulas
Using the general procedure the authors consider some combination of different approximation processes by means of projections on orthogonal subspaces. They concentrate their attention on some particular positive approximation processes in the space of \(L^2\)-real functions in order to satisfy a prescribed asymptotic formula.
Bernstein-Kantorovich and Bernstein-Durrmeyer operators
scientific article; zbMATH DE number 5720613